is this acceptable ?

[wireman1]

a company has a existing 2000 amp main distribution service which the utility has monitored for the highest load which was around 1500 amps . they also experienced spikes. the company is now putting a new section of switchgear which is rated at 3000 amps with a 3000 amp breaker the utility is not going to change out the transformer which they maintain or up grade the wiring from the secondary to the main breaker. they are going to put current limiters on the secondary side of the transformer and do a gfp test to set the tripe setting on the main breaker which is required by 230 -95 (c) is this acceptable with out upgrading the wiring from the secondary since the transformer is owned and maintained by the utility

 

[iwire]

is this acceptable with out upgrading the wiring from the secondary since the transformer is owned and maintained by the utility

Code wise it is entirely dependent on the location of the service point.

Service Point. The point of connection between the facilities
of the serving utility and the premises wiring.

 

[augie47]

Code wise it is entirely dependent on the location of the service point.

exactly !
If the service point is the transformer and you have a 3000 amp main, then NEC would require service conductors to be rated at a minimum of 3000 amps.
If the service point is the gear, the POCO can install conductors to meet their
specifications.

I have inspected some pretty scary installs where the gear is the service point and the incoming POCO conductors are well below NEC requirements, but none of them have burned yet.

 

[iwire]

Had they chosen to go with a 3000 amp main lug only gear which contained multiple service disconnecting means the NEC would allow the 2000 amp conductors to remain based on the existing load of 1,500 amps.

 

[wireman1]

is this acceptable

is this acceptable

thanks iwire and augie 47 for the info. the service point is the switch for the utility